AVR Troubleshooting

My apologies, Automatic Voltage Regulator.

Cbrunner

It is clear that it is about an Automatic Voltage Regulator for alternator, no need to apologize if someone didn't get it

you can connect your 220V to the sensing input of AVr and to the power input,

with the voltage setting potentiometer, when turning it in :raise: direction your bulbs should turn on gradually, when turning it in decrease direction, bulbs would turn off

with sudden change in stability potentiometer your bulbs will glow and back to their previous status,

If none of this happens, this could mean a bad thyristor / diode

Good luck

Thank you, that was what I expected. Now I just need to see if these AVR's for three phase applications use all three legs for regulator power, or just one/two of the legs (thankfully the field is marked).

Right now the one unit I am testing does not want to function at 220v - as the SR7 book says "turn power up to 200v, anything higher and the lights will go out" I am expecting that I need to lower my input voltage. Everything I try to do right now to lower the input voltage causes a few loud snaps and some bright flashes of light - followed by some muttering and a flurry of fuse replacements.